Aside from appearances by Taylor Swift and Coldplay, dozens of performers are set to play, with every style from country to R&B in the lineup.

"Each year we bring the music of the iHeartRadio app to life at the iHeartRadio Music Festival, redefining the live music experience for fans across America with once-in-a-lifetime performances and incredible collaborations that nobody else can provide," Clear Channel CEO and Chairman Bob Pittman said.

Host Ryan Seacrest will kick off the event on the evening of Sept. 19. "Year after year the iHeartRadio Music Festival continues to deliver an unprecedented music experience for millions of fans nationwide. I couldn't be more excited to be part of it," Seacrest said. "The adrenaline-pumping performances by pop stars and legendary artists alike, the never-seen-before collaborations, the energy of the fans and the artists — this is truly an event like no other."

A limited number of advance tickets go on sale today at 1 p.m. PST for MasterCard holders. General public sales begin July 26 at 10 a.m. PST via Ticketmaster.

If you aren't able to make it in person this year to the festival, Clear Channel will also be broadcasting coverage on their stations and Yahoo Screen will live-stream the events exclusively.

Who is your favorite performer in the 2014 iHeartRadio Music Festival lineup?